Answer
$$4x^2+11x-20$$
Work Step by Step
Expanding the equation by combining like terms where possible, we find:
$$ 12x-8x^2+\left(5+4x\right)\left(3x-4\right) \\ 12x-8x^2+12x^2-x-20 \\ 4x^2+11x-20$$
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 3 - Quadratic Functions - Exercises for Skills for Factoring - Page 134: 18
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